funguje

du1/program.c

@@ -0,0 +1,18 @@
+#include<stdio.h>
+
+   int main(){
+        int counter=0, Sym;
+        char OutSym;
+
+        while(1){
+          Sym=getchar();
+         if(Sym==EOF || Sym==0)break;
+         else if(Sym<='Z'&&Sym>='A')Sym +=32;
+         else if(Sym<='z'&&Sym>='a')Sym-=32;
+        counter++;
+        OutSym=Sym;
+        putchar(OutSym);
+}
+        printf("\nPočet riadkov: %d\n",counter);
+   return 0;
+}